package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.DeleteMapping;

import java.util.List;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 套餐分页查询
     *
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.PageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 新增套餐
     *
     * @param setmealDTO
     * @return
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {
        //向套餐表插入一条数据
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.save(setmeal);

        //获取主键值
        Long id = setmeal.getId();

        //向套餐菜品表插入多条数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size() > 0) {
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(id);
            });
            setmealDishMapper.insertBatch(setmealDishes);
        }

    }

    /**
     * 批量删除菜品
     * @param ids
     * @return
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前套餐是否存在起售中的套餐
        for (Long id : ids) {
            Setmeal setmeal = setmealMapper.getById(id);
            if(StatusConstant.ENABLE==setmeal.getStatus())
            {
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }
        //根据套餐Id删除套餐表中的套餐数据
        setmealMapper.deleteById(ids);
        //根据套餐Id删除套餐菜品表中关联的菜品数据
        setmealDishMapper.deleteBySetmealIds(ids);
    }

    /**
     * 根据id查询套餐
     * @param id
     * @return
     */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        //根据Id查询套餐数据
        Setmeal setmeal = setmealMapper.getById(id);
        //根据Id查询菜品数据
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);
        //封装到SetmealVO
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     * @return
     */
    @Override
    public void updateWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //修改套餐表数据
        setmealMapper.update(setmeal);
        //删除原有菜品数据
        setmealDishMapper.deleteBySetmealId(setmealDTO.getId());
        //重新插入菜品数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size() > 0) {
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmeal.getId());
            });
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    /**
     * 套餐起售停售
     * @param id
     * @param status
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品则不能起售
        if (status.equals(StatusConstant.ENABLE)) {
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            //左外连接查询，根据套餐id查询菜品以及对应的菜品套餐关系数据，a.*所以返回所有菜品数据
            List<Dish> dishes = dishMapper.getBySetmealId(id);
            if (dishes!=null && dishes.size()>0) {
                dishes.forEach(dish -> {
                    //菜品起售中，无法起售套餐
                    if (StatusConstant.ENABLE==dish.getStatus()) {
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        Setmeal setmeal= Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
